Joint USAF/NOAA Report of Solar and Geophysical Activity

SDF Number 105 Issued at 2200Z on 15 Apr 2011

IA. Analysis of Solar Active Regions and Activity from 14-2100Z to 15-2100Z

Solar activity increased to moderate levels. Region
1190 (N13W26) produced an M1/1F flare at 15/1712Z. Associated with
this event were discrete radio emissions ranging from 4995 MHz -
15400 MHz. Occasional C-class flares were also observed during the
period. Region 1190 and Region 1193 (N17E44) remain the most
significant regions. Both Regions 1190 and 1193 showed increases in
areal coverage. A filament was observed lifting at 14/2324Z on GOES
SXI. A CME was observed on SOHO/LASCO C2 imagery at 15/0036Z, with a
speed of approximately 390 km/s. STEREO imagery showed the CME is
expected to be geoeffective.

IB. Solar Activity Forecast

Solar activity is expected to be at
low levels, with C-class flares expected for the next three days
(16-18 April). There is also a slight chance for M-class flares
during the period.

IIA. Geophysical Activity Summary 14-2100Z to 15-2100Z

The geomagnetic field was at quiet levels. The greater than 2 MeV
electron flux at geosynchronous orbit reached high levels during the
period.

IIB. Geophysical Activity Forecast

The geomagnetic field is
expected to be predominantly quiet for the next three days (16-18
April).

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